Totalizer clear signal



A. F. PUOLE TOTALIZER CLEAR SIGNAL.

APPLICATION FILE-D NOV-17,1919.

Patented Aug. 22, 1922. I

7 SHEETS-SHEET 1.

' .A- F. POOLE. TOTALIZER CLEAR SilG-NAL. APPLICATION FILED NOV. 17. m9.

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"TOTALIZER CLEAR SIGNAL. APPuc moN FILED NOV. I7. 1919.

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APPLICATION HLED NOV-17, 1919.

Patented Aug. 22, 1922.

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APPLICATION FILED NOV. 12, 1919. -1',426,502, Patented Aug. 22, 1922' '1 SHEETS-SHEET 5.'

A. F. Roouz. TOTALIZER CLEAR SIGNAL.

APPLICATION FILED NOV.'17|l9l9.

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v 'A. F. POOLE. 'TOTALIZER CLEAR SIGNAL: APPUCATIDN FILED NOV. I7, 1919. 1 ,426,502,- Patented Aug. 22, 1922.,

7 SHEETS-SHEET I.

UNITED STATES PATENT OFFICE.

ARTHUR r. rooLnor KnmLwon'm-r; ILLINOIS, assrenon, BY ivrnsnn ASSIGNMENTS,

TO REMINGTON ACCOUNTING MACHINE CORPORATION, OF NEW YORK, Y A" CORPORATION OF NEW YORK.

TOTALIZER CLEAR ISIG-NAL.

Application filed November 17, 1919. Serial No. 338,442.

To all whom it may concern:

Be .it known that I, ART UR F. PooLE, a citizen otthe United States, residing at Kenilworth, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Totalizer Clear Signals, of which the following is a'specification.

My invention is a calculating machine and has particular relation to a total clear. signal for the purpose of insuring that the correct total shall be extracted from the machine.

My invention is shown as applied to the well-known Wahl machine nowextensi'vely marketed by the Remington Typewriter Company and the structure of which is described in numerous issued patents, particularly the patent to vi ahl, No. 893,719, dated July 21, 1908, supplemented by the disclosure of the patent to -Wahl, No. 1,270,471, dated June25, 1918. y y

In the Vahl machine, which is a typewritingadding machine, tl1ere is present a typewriter which is adapted to write both letters and numerals, tho typewriter being provided with the customary platenand'ribbon mechanisms. Cn the front part of the typewriter is mounted what is called an actuator, and this actuator is connected to the numeral keys oi the typewriter. The function otthe actuator is to translate the vertical reciprocation of the typewriternir meral keys into a differential rotation of wheel called the master wheel. The direction of rotation of the master wheel is controlled by a gear-Shifting mechanism, so that the wheel may rotateei ther in a direction determining addition orin a direction determining subtraction upon theopcration oi? the typewriter numeral keys.

Also mounted on the front of the typewriter is a truck sliding; in vbearins s and suitably connected to the typewriter carriage so as to advance step by step with said.

To insert a then pressed, with the result that the master wheel rotatesa number of steps, corresponding to said digit, and inserts the digit into the .totalizer, the direction of rotationof the master wheel being determined by the posi tion of a .gear shifting; mechanism. After the insertion of the first digit the typewriter carriage escapesone step, carrying with it the truck and its thereon (mounted totalizers. The mechanism is now in position for the reception of the second digit of: the number. The numeral key correspond ing tothis digit is operated, resulting in the inserting, of the second digit into the totalizer. Numbers are :insertcd into the totalizer in this manner digit by'digit until the entire number has been inserted. The paperis then line spaced and the mechanism is ready for thereception of a new number.

The VVahl machine has no means for automatically printingout the total. WVhen one wishest-o print out atotal appearing in one of the totalizers, the gear shitting mecha.

nism is put intoa position determiningsnbtraction, the carnage -1s tabulated so that the master wheel is in anesh with the totaL- izer at the first significant digit and the numeral keys are operated in the succession shown by the number exhibited in the to in the totalizer, and in consequence thereof operatesithe wrong digit key. This results in the totalizer being lettwith a number still init, instead of being wholly clear. If the error is not noticed and a new computation commenced, the new computation will, of course, be in error by the number left in the totalizer; This will result in two erroneous computations, the one in which the total was erroneously extracted and the new computation which started with the totalizer not cleari My herein described invention has for one of its objects the forestallingor rendering impossible the erroneous manipulation just Specification of Letters Patent. Patented AuggZZ, 1922 described, and to this end I have provided a special key which is provided with a characteristic type, such as a star. This star is always printed to the right of an extracted total. In the event that the totalizer is not clear at the time it is attempted to print this star, then the star key cannot be put through its complete cycle, but will be locked up. The attention of the operator will be called to the mistake by the fact ol its being impossible to further operate the calculating machine; the mistake will then be rectified and the correct total written out.

Another object of my invention is to so interlock the star printing key with. the other mechanism that said key cannot be operated, except to print a star at the right of a total which has been extracted from the machine.

Another object of my invention is to provide mechanism in the totalizer cooperating with mechanism in the actuator, to the end that when an attempt is made to operate the star printingkey without the total being completely extracted from the totalizer, this star printing key will be held in its depressed. position.

Another object of my invention is to combine the 9 test described in my issued Patent No. 1,283,293, patented October 29, 191.8, with the mechanism "for holdingthe star printing key in its depressed position in the event that one attempts to print a star after a number which is not the correct total of the numbers entered into the totalixer; in other words, if one attempts to print this star when the totalizer is not clear, thus providing a double safeguard.

The above and other objects of my invention will be apparent to those skilled in the art from a reading of the following specification and claims:

My invention may be best understood by reference to the following figures of drawings, o't which-- Fig. 1 is a front view of a typewriting and calculating machine equipped with my improved device;

Fig. 2 is a. back view of the adding mech anism;

Fig. 3 is aperspective view of the parts peculiar to my present invention;

Fig. 4 is a section along the lines of Fig. 1;

Fig. 5 is a section along of Fig. 1;

Fig. 6 is a front view of shown. in Fig. 5;

7 is a section of the cross actuator and totalizer on the line 77 of Fig.

Fig. 8 is a perspective view of a modified term of my invention.

Referring particularly to Figs. 1 and the typewriter 10 is provided with ten the lines 5:)

the mechanism numeral keys, Nos. 11 to 20 inclusive, the key 20 being the key associated with the zero, this key printing 0, but not inserting any number into the totalizer, the action ot the key serving simply to space the type writer and actuate certain universal mem bers in the actuator, such as the full stroke pawls and the master dog to be hereinafter described.

Each oi the numeral keys is connected by a pull rod 21 to fans in the actuator, which fans may be identified as the fans ill in Fig. i l of the cited patent to ll ahl, No. 1,270,471. The fans 22 are rotatably mounted on a fixed rod 23, and each or them except that connected with the zero key serves to actuate a goosencck at, which serves to give a differential rotation to a sector shaft 25 mounted in the framework of the machine. The differential rotation of the sector shaft ultimately results in the differential rotation of a master wheel 26. It will not be necessary to trace the chain oi": mechanism between the sector shaft 25 and the master wheel 26. since this mechanism has been thoroughly described in said patent to lVahl, No. 1,270,4571, to which reference may be had tor a detailed description oi the operation.

There is a fan 22 associated with each ol? the pull rods 11 to 20 inclusive, and, as thonoughly described in the cited patent to li ahl, No. 1,270,471, motion of any of the numeral keys results in differential rotation of the master wheel.

The vertical totalixers 27, E29 and 30 are mounted on a truck 81, which is connected to the typewriter carriage (not shown), and advances synchronously with said carriage, thus bringingsuccessive totalizers into cooperation with the master wheel 26. There also provided a cross totalizer 252, which is adapted to be picked up and reciprocated by the vertical. totalizers 27 to 30 inclusive during" the travel of the carriage. The cross totalizer will thus add numbers written in a lmrizontal line, and, simultaneously, each ot the vertical totalizers to 30 inclusive will. accumulate the numbers written in a column. lit will not be necessary to describe the mechanism by which the cross totalizcr is rcciprocatod, since this mechanism is also very thoroiughly described in the cited patent to \Vahl, No. 1,270,471.

The cross totalizer is actuated by the cross actuator 33 having); a cross master wheel 3 The cross actuator 33 is connected to the main actuator by a pair of links 36. but one of which is shown in my present application. the complete mechanism being fully shown in the cited patent to d ahl. No. 1.270%71, in which the links are numbered 16% and 167 (Fig. 4-... Sheet 3). The i in actuator 35 is provided with rockshart 3T,

, culating parts in the cross actuator 33 are given movements concurrent withthe movements of the calculating'parts in the vertical actuator 35. It will not be necessary to trace in detail the mechanisms by which this result is accomplished-since this mechanism is also thoroughly described in the cited patent to lVahl, l lo. 1,270,t7 1.

The vertical master wheel 26 is provided with a gear control consistingof mechanism whose position is governed by the vertical control handle 39, the position of said han ,dle determining that the vertical master wheel shalloperate its then associated totalizer either in addition, subtraction or disconnect. a

The cross master wheel 34- is adapted to be controlled from either of two sources, one of these is a manual. control operated by the handle 40, and the other isuan automatic control operated by cams ll, 4-2 and 413, mounted respectively on the vertical totalizers27, 28 and 30. It is not necessary to trace out the mechanism by which thesecams 41, -12 and 4:3 and theliandle control the cross master wheel 3 1, since the mecha nism is like that described in the cited patent to lvahl, 1370, 171, for performing asirnilar function. It will be sufiicient to note that the master wheel m-ay be either in addition, substraction or. disconnect, deter- 1 mined by the position of the handle l0, and

that it also maybe in either addition. sub-- traction-or disconnect, as determined by one of the cams d1, -120r 4:3 or bythe absence of any such cam, A control shift handle 4A, byv its position, (lQllGlH'llllQS whether the position of the handle 40 shall be effective to control the state of the master-wheel 3%,01 whether the state of said wheel shall be determined hythe automaticcontrol consisting in part of the cams 41, 12 and' l I In addition to the gear controls above described, the lVahl machine is also provided with a universal correcting lever 45. The function of this lever is to throwboth the vertical master wheel 2oand the cross master wheel 3% into the reverse oftheir conditions, as determinedby the positicnof'the other gear controlling mechanism on the machine. Tliis is for the purposeof correcting anerroneousinsertion in the totalizer. The mechanism "constituting the gear controls just described is the same as that shown in the cited patent to l/Vahl, No. 1,270, 17 1, and since this gear control mechanism has been thoroughly described in said patent, it will not be necessary torepeat the description in thisplace. I shall nowdescribe the-mechanism peculiar to my present invention. This mechanismcan be best understood by reference to Fig. 3, which 'is a perspective view ofthe parts peculiar to any present invention.

In Fig. 3 Ihave shown my invention as applied to the'cross totalizer of a 'Wahl machine. The "mechanism may be divided into two parts, which will 'be described separately, although both of these parts cooperate to the'common end of preventing the operation of-the star key unless the vcross totalizer'stands at clear. One of these parts is a function computing device similar in theory to the'devicedescribed in-my issued fatent No. 1,283,293, date'dOctober 29, 1918, and adapted to compute the Q-function of the numbers entered into the totalizer. The purpose of this mechanism may be briefly stated here to be-the'prevention of the opera tion of the star printing key except the totalizer stands at Zero or ata multiple of 9. The theory of the mechanism need not be given in'this place, since it is thoroughly described in my PatentNo. 1,283,293, just referred to. For the purpose of'theprescnt disclosure. it will be sufficient to note that the cross master wheel 34 is mounted on a shaft 46 rotatably mounted in the framework of the machine. lwounted on the shaft as is a gear 47 having the same numa mounted on it a gear 49 having 27 teeth,

said teeth meshing with the gear 47.

Rigidly mounted onthe shaft 48 is. a control' cam 50 having three notches '51, 52, and 53 therein, these notches being spaced 120 apart. An indicator lever 54 is pivoted in the framework on a shaft 55 and has a nose 56 adapted to enter any of the notches 51, 52, or 53.- The indicator lever 54: is held in contact with thecamBO by means of a spring 57 extending between the lever 5 1- and a'stud 58 mounted inthe framework of the cross actuator.= The indicator lever 54 is provided with a pointer 59, which when the nose 56 is in registry with any of the notches 51, '52 or 53-s'tands opposite an indicator mark 600nthe casing of the cross actuator; lllounted on a shaft 61, rotatalbly:m-ounted in the cross actuator, is a bell crank 62having anose '63 "adapted 'to'register'with the notches'5l,52 and 53. The'lever262 is con nected bya link 64 with a lever 65 pivoted at 66 in the cross actuator andengaginglhy a pivoted on the cross actuator at 68. The lever 68 is joined by a pull rod '70 to the star printing), key 71.

In Fig. 3 l have shown the inc-chaplain just described displaced from its normal. po sition in oriler to clearly show the chaiirof mechanism between the cam 50 and the kev 71. in Fig. 3 the pull rod 70 is numbercl l both at its connection with the lever 67 and at its connect on with the key 71. 111 the machine these two portions are coincident. al thoi'lgh in the drawing in Fig. 3 thev are shown separated. I

From the above it is evident tha when any of the notches 51, 52 or 53 is in lt stry with the nose ('33, tl'ien the star printing key 71 may be operated. If, however, the nose 62-, is resting on the concentric surface of the cam 50, then the star printii key cannot be operated. i

From the theory of the operation of the mechanism just described, as given in my cited Patent No. 1283.293, it will be evident that if the position of the cam 50, as shown in Fig. 3. is coincident with the cross tota izer standing: at Zero and then a series of numbers are inserted into the cross totalizer, coincidence of the notches 51, 52 or 530 with the nose will not occur, unless the totalizer stands either at zero or at some multiple of 9. riccordinrgly. if at the beginning; of a computation the disc 50 is set so that the nose 6S coincides with one of the notches 51, 52 or then it will not be possible to print the star key unless the cross totaliszer stands either at zero or some multiple of 9, viz, 9, 99, 198, etc.

This condition will obtain regardless of whether numbers are inserted into the totalizer in addition or in subtraction. Consequently if a. series of numbers are added into the cross tota liver and then the total of these numbers is subtracted out, the totalizer should stand at zero and the operation of the star key 71 will be permitted. However, if the total has not been completely extracted, the operation of the star printkey 71 will not be permitted unless it so happens that the numberleft in the totalizer is some multiple of 9. It is therefore desirable to combine the 9 test mechanism just dcscribed with an additional mechanism which will insure the attention of the operator be ing directed to the case in which the 9 test will give an incorrect result, that is, the case in which the number standing in the totalizer after a clearing operation is some multiple of 9.

To take care of this latter case, I have provided the cross totalizer 32 with a mechanism which, in the event the star printing key is operated'when the totalizer does not stand at zero, will prevent the start printing key 71 from returning to its normal position and thus the attention of the operator will be called to the fact that an incorrect total has been subtracted from the totalizer. This latter mechanism will now be de ibed.

The cross totalizer 32 is provided nith a set of number wheels 72 which are visible through a window 78 (Fig. 7) in the casing 74 of the totalizer 32. Rigid with each of the number wheels 72 is a gear 75, by means of which the number wheels are driven from the gears 76 in the totalizer. The cross totalizer 32 is in the main exactly like the cross totalizer described in the cited patent to l l ahl, No. 1,270,171, and the mechanism of this totalizer and its operation need not be further described herein.

Each of the gears is provided with a snort tooth 77, by means of which the zero position of the number wheels 72 may be determined.

liotatably mounted in the framework of the totalizer is a shaft 78 having a series of comb teeth 79 thereon, there being one of these teeth for each number wheel of the totalizer. The comb teeth 79 are in the plane of the gears 75, and are ur cd into contact with said gears by a spring 80, which urges an arm 81 rigid with the comb teeth 79 to rotate in a counterclockwise di rection (Fig. However, the teeth '79 will be in the position shown in Fig. 3, except the totalizer stands at zero. in which event all of the short teeth 77 will be opposite the cooperating tooth 7 9 and said teeth will rotate under the influence of the spring 80. ll hen the arm 81 rotates, it actuatcs latch 82 rotatably mounted on a stud 83 in the side plate of the totalizer 32. A spring 8 1, extending between the latch 82 and a stud 85 in the framework tends to hold the latch 82 in the position shown in 1-1 bell crank lever is rotatably mounted on a cross shaft 87 in the totalizer side plates, and a spring 88 extending between the lever 86 and a stud 89 in the totalizer side plate tends to give the lever 86 a tendency to rotate in a counter-clockwise direction (Fig. 3). The lever 86 has a fork in its lower end having prongs 89 and 90, these prongs being in a position to be engaged by the master dog 91 customarily present in the lVahl machine, and whose action is fully explained in the description of the dog 123, page 5 lines 16 to 70 of the cited patent to lVahl No. 1,270,451. The prongs S9 and of the fork are, as before noted, adapted to be engaged by the master dog when the totalizer is one space to the left of the lowest decimal place, which place 1 shall hereinafter call the sub-units place of the totalizer. The star printing key 71 is attached by a pull. rod to a special fan 93 in the vertical actuator. Consequently when the key 71 is operated, there will result motion of the cross master (log 91, which will raise the lever 86 from its normal position, as shown in Fig. 7, to its position as shown in Fig. 3. If new there is a number present in the totalizer, the latch 82 will be in the position shown in Fig. 8. Consequently, the

lever will be held in its upper position,

and upon the attemptedreturn, of the master dog theprong 90 of the fork will pre vent the master-dog from returning to its normal position. i

I shall now explain how prevention of return of the master dog to its normal posi tion will lock the star key 71 in its depressed position. The vVahlmachine is provided with what isknown as a full stroke mechanism. This consists of the pawls 94 and 95,wl1ich are adapted to engage teeth 96 and 97 present on all of the fans. It will be remembered that. on the downstroke of the key in the Wahl machine the rockshaft 87 is thrown to the position shown in Fig 3. An arm 98 is rigid with the rockshaft, and, by engaging an arm 99 rigid with the front fullstroke pawl 95, holds this pawl out of engagement with the teeth 97, thus permitting the downstroke of the key. However, the back fullstroke pawl 9 1 is held by a spring 100 connected between the fullstroke pawls 95 and 9d into engagement with the teeth 96.

It is explained in the cited patent to Wahl, No. 1,270,431, how, on the upstroke of the key the rockshaft 37 is thrown to a rear position and when in said position a lever 101 rigid with the back fullstroke pawl 94ris engaged by the arm 98 and said pawl lifted out of engagement with the teeth 96, thereby permitting the upstroke of the key. It will be evident that if by its normal position is prevented, then the back fullstroke; pawl 94: will not be lifted from its engagement with the teeth 96 and therefore the return stroke of the key 71 will be prevented. It has been pointed out before herein that the rockshalt 37 of the vertical actuator is connected to the cross rockshaft 88' by the parallelogram link 36. The cross rockshaft 38 has mounted rigidly upon it a crank arm which is connected by a link 103 with a cam plate 104k engaging with a roller 105 on the master dog 91. Rotation of the rockshaft 3.8, by means: of the cam plate 104: thus rocks the master dog 91 from its normal position as shown in Fig. 7 into its displaced position, as shown in Fig; 3. Consequently, if the master dog 98 is prevented from returning to 1ts. normal position by the prong 90, then thereturn of the cross rockshaft38 to its normal position will be prevented and in consequence return of the vertical rockshaft 37 will be prevented. This Wlll prevent the changing of the fullstroke pawls from the rear pawl 9 1 to, the front pawl 95, and the rear any means the return of the rockshaft to pawl 9 1 will remain in engagement with the teeth 96. Upward motion of the key 71 will, therefore, be prevented.

From the preceding it is apparent that if the star key 71 is operated at a time the totalizer does not stand at Zero, then the key 71 will not be able to complete its stroke and will be held in its depressed position. If, however, the key 71 be oper ated when the totalizer 32 stands at zero, then, because the short teeth 77 are opposite the teeth 7 9, the arm 81 may rotate slightly under the influence of the spring 80 and thus hold the latch 82 out of a position to engage the lever 86. Said lever will then return to its normal position upon theup stroke of the key, and thus the star printing key. may perform a complete stroke without interference.

It is to be noted that the cam 50 will prevent the, operation of the, key 71, except when the totalizer stands-at Zero or a multiple of 9, such as 99, 198, etc. However, if the totalizer 32 stands at a multiple of 9 other than zero and it isattempted to operate the key 71,, thensaid key will not be able to go through a complete stroke, but will be held at the bottom of its downstroke and the attention of the operator will be called to the fact: thatthe key 71 has been operated without the totalizer being clear.

In order to release the mechanism after a misoperation of the key 71,1 have provided the latch 82 with a fingerpiece 105 which projects through the side plate of the totalizer and by which the latch 82 may be operated when the key 71 is held in its bottom position as just'described, then by means of the finger-piece 105 the latch 89- is pulled out of engagement with the lever 86. This will permit thereturn of the star printing key 71. The totalizer is then corrected, that is, the number standing in the totalizer is subtracted out, and when this is done the star key 71 may be operated a completeistroke without interference.

It is desirable that the star printing key be so interlocked with the numeral keys that it is possible to operate the star printing key only in the sub-units place of the totalizer. To this end I have provided the vertical totalizer 30 with a cam 106 adapted to engage a roller 107 mounted on a crank arm 108 rigid to a shaft 109 rotatably mounted in the framework of the machine. In the rear end of the shaft 109 is a lever 110 which is connected by apin and slotconnection 111 with a lever 112 rotatably mounted on a stud 113 in the framework of the machine.

Pivoted on the lever 112is a pendant 114:, having a slot 115 therein which controls a pin 116 mounted in one of the single key cams 117 ofthe single key mechanism, and said pendant has also a slot 118 which controls, a pin 119. in the cam 120 of the single key mechanism, it being understood that both the cams 120 and ll? are pivoted in the framework on shafts 121 and respectively. The special fan 93 connected to the key 71 is next to the extreme righthand fan of the actuator. VVhen the pendant lid is in the position shown in Fig. 2, the cams 11'? and 120 are held together, and consequently the fan 93 cannot be operated, although the two cams 117 and 120 may move together as a whole, thereby permittingthe operation of any of the numeral keys, since the pendant list is pivoted on the lever 112. However, when the cam 106 engages the roller 1.07 and thereby lowers the pendant 1 letinto the position shown in Fig. 3, the cams 11,7 and 120 are separated so as to allow the fan 93 to be operated. llowiiiver, at this time none of the numeral keys can be operated, since the cams of the single key mechanism allow but a single key to be operated at any time, and the fact of there being a space between the cams 11? and 120 will prevent any of the numeral keys from being operated. The mechanism just described thus has the function of preventing the operation of the star printing key 71 in any space except the sub-units space of some particular totalizer, in this case the totalizer 30, and at that point preventing the operation of any of the numeral keys.

In Fig. 8 I have shown my improved invention as applied to a vertical totalizer. In this case the totalizer containing the parts corresponding to the lever 85, the latch 82, the comb 79, etc., have been identified by prime marks. Their functions will be readily understandable from a description of the same parts as present in the cross totalizer 32. In the event that it is desired to make one of the vertical totalizers controlling as to the printing of a total, it is, course, necessary to leave the parts corresponding to the lever 86, the latch 82, etc, out of the cross totalizer 32.

Before using my improved device, it is, of course, necessary that the disc 50 be set so that one of the notches 51, or be in registry with the nose 56 before computation is commenced. The alignment of the pointer 59 with the mark 60 will give an indication of whether this condition obtains. If not, the actuating mechanism may be very easily brought to this condition by simply operating one numeral key a suflicient number of times to bring the pointer 59 into alignment with the mark 60. hen this is done, the computation may then be commences lVIany variations may be made from the precise structure herein show and described without departing from the spirit of my invention, since I claim:

1. Ina calculating machine, the combina tion of an actuating mechanism, a totalizer, a zero determining device located in said totalizer, a function computing device located in said actuator, and means for printing a characteristic mark, said means being controlled by the joint action of said zero determining device and said function computing device.

2. 111 a calculating machine, the combina tion of a totalizer, an actuating mechanism, a zero determining device in said totalizer, a function computing de ice governed by the condition of said actuator, and means controlled concurrently by the zero determining device and the function computing device for printing a characteristic mark indicative of the return of the totalizer to zero.

In a calculating machine, the combination of an actuating mechanism, a key, means for preventing the operation of said key unless said actuating mechanism has been turned through a number of steps which are an integral multiple of 9, a total izer adapted to be actuateil by said actuating mechanism, and a control in said totalizer to prevent the complete operation of said key unless said totalizer stands at zero.

1-. in a calculating machine, the combination of a totalizer, an actuating mechanism adapted to insert numbers into said totalizer seriatim, a function computing device governed by the condition of said actuator, a zero determining device in said totalizer, and means for printing a characteristic mark indicative of the return of said totalizer to zero, said printing means being con trolled by the joint action of said zero determining device and said function computing device.

In acalculating machine, the combination of a set of numeral keys, actuating mechanism operated by said numeral. keys, a universal member in said actuating mechanism adapted to be operated upon the operation of any of said numeral keys, a function computing device associated with said actuator, a special key also operative on said universal member, means to prevent the operation of said special key unless said functio computing device stands at 9 or an integral multiple thereof, a. totalizer, and means associated with said totalizer to prevent the complete operation of said universal member by said special key unless said totalizer stands at zero.

6. In a calculating machine, the combination of a set of numeral keys, actuating mechanism operated by said numeral keys, a universal member in said actuating mechanism adapted to be operated upon the operation of any of said numeral keys, a function computing device associated with said actuator, a special key for printing a characteristic mark, means to prevent the operation of said special key unless said function computing device stands at 9 or an integral multiple thereof, a totalizer,

tion of a traveling carriage, a series of numeral keys, a clearance proof key, and means controlled by said carriage at a pre determined point in its travel to lock said numeral keys and to unlock said clearance proof key, said means normally maintaining said clearance proof key locked.

8. In a calculating machine, the combination of a carriage, a series oi muneral keys, a clearance proof key, a series of devices actuated by said keys, a series of single key cams permitting the operation of but one numeral key at a time and normally locking said clearance proofkey, and carriage controlled means acting on certaino'lf said cams to unlock the clearance proof key and to lock the numeral keys.

9. In a calculating machine, the combination or" a carriage, a plurality of column totalizers mounted on said carriage, a cross totalizer, a clearance proof key for said cross totalizer, and means controlled by one of said column totalizers for controlling the operativeness of said clearance proof key. I

10. In a calculatingmachine, the combination 01"" a carriage, a series of column totalizers, a cross totalizer, a normally inoperative clearance proof key forsaid cross totalizer, and means associated \vith one of said column totalizers for making said key operative.

11. In a calculating machine, the combination oi a carriage, a cross totalizer adapted for the calculation of numbers Written in column positions determined by said car- 1n wltness whereof I have hereunto subscribed my name.

ARTHUR F. POOLE. 

